// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef UI_GFX_GEOMETRY_POINT_F_H_
#define UI_GFX_GEOMETRY_POINT_F_H_

#include <iosfwd>
#include <string>
#include <tuple>

#include "ui/gfx/geometry/point.h"
#include "ui/gfx/geometry/vector2d_f.h"
#include "ui/gfx/gfx_export.h"

namespace gfx {

// A floating version of gfx::Point.
class GFX_EXPORT PointF {
public:
    PointF()
        : x_(0.f)
        , y_(0.f)
    {
    }
    PointF(float x, float y)
        : x_(x)
        , y_(y)
    {
    }
    ~PointF() { }

    explicit PointF(const Point& p)
        : PointF(static_cast<float>(p.x()), static_cast<float>(p.y()))
    {
    }

    float x() const { return x_; }
    float y() const { return y_; }
    void set_x(float x) { x_ = x; }
    void set_y(float y) { y_ = y; }

    void SetPoint(float x, float y)
    {
        x_ = x;
        y_ = y;
    }

    void Offset(float delta_x, float delta_y)
    {
        x_ += delta_x;
        y_ += delta_y;
    }

    void operator+=(const Vector2dF& vector)
    {
        x_ += vector.x();
        y_ += vector.y();
    }

    void operator-=(const Vector2dF& vector)
    {
        x_ -= vector.x();
        y_ -= vector.y();
    }

    void SetToMin(const PointF& other);
    void SetToMax(const PointF& other);

    bool IsOrigin() const { return x_ == 0 && y_ == 0; }

    Vector2dF OffsetFromOrigin() const { return Vector2dF(x_, y_); }

    // A point is less than another point if its y-value is closer
    // to the origin. If the y-values are the same, then point with
    // the x-value closer to the origin is considered less than the
    // other.
    // This comparison is required to use PointF in sets, or sorted
    // vectors.
    bool operator<(const PointF& rhs) const
    {
        return std::tie(y_, x_) < std::tie(rhs.y_, rhs.x_);
    }

    void Scale(float scale)
    {
        Scale(scale, scale);
    }

    void Scale(float x_scale, float y_scale)
    {
        SetPoint(x() * x_scale, y() * y_scale);
    }

    // Returns a string representation of point.
    std::string ToString() const;

private:
    float x_;
    float y_;
};

inline bool operator==(const PointF& lhs, const PointF& rhs)
{
    return lhs.x() == rhs.x() && lhs.y() == rhs.y();
}

inline bool operator!=(const PointF& lhs, const PointF& rhs)
{
    return !(lhs == rhs);
}

inline PointF operator+(const PointF& lhs, const Vector2dF& rhs)
{
    PointF result(lhs);
    result += rhs;
    return result;
}

inline PointF operator-(const PointF& lhs, const Vector2dF& rhs)
{
    PointF result(lhs);
    result -= rhs;
    return result;
}

inline Vector2dF operator-(const PointF& lhs, const PointF& rhs)
{
    return Vector2dF(lhs.x() - rhs.x(), lhs.y() - rhs.y());
}

inline PointF PointAtOffsetFromOrigin(const Vector2dF& offset_from_origin)
{
    return PointF(offset_from_origin.x(), offset_from_origin.y());
}

GFX_EXPORT PointF ScalePoint(const PointF& p, float x_scale, float y_scale);

inline PointF ScalePoint(const PointF& p, float scale)
{
    return ScalePoint(p, scale, scale);
}

// This is declared here for use in gtest-based unit tests but is defined in
// the gfx_test_support target. Depend on that to use this in your unit test.
// This should not be used in production code - call ToString() instead.
void PrintTo(const PointF& point, ::std::ostream* os);

} // namespace gfx

#endif // UI_GFX_GEOMETRY_POINT_F_H_
